作 者 ：范少辉,肖复明*,汪思龙,官凤英,于小军,申正其
期 刊 ：生态学报 2009年 29卷 11期 页码：5971~5977
Keywords:Moso bamboo plantation, soil respiration, autotrophic respiration, heterotrophic respiration, litter respiration,
摘 要 ：采用CID-301PS光合分析仪(配带土壤呼吸室)，对湖南会同林区毛竹林地土壤呼吸进行测定，结果表明，毛竹林地土壤总呼吸速率、异养呼吸速率、自养呼吸速率及凋落物呼吸速率的年平均值分别为2.13、1.44、0.69μmolCO2?m-2?s-1和031μmolCO2?m-2?s-1，并呈现明显的季节变化规律和日变化规律，季节变化曲线呈单峰型，表现为1~7月份随着气温、地温的升高呈上升的趋势，在8月达年呼吸速率的最大值，分别达4.95、3.01、1.94μmolCO2?m-2?s-1和0.80 μmolCO2?m-2?s-1，此后随温度的降低而呈逐渐递减的趋势，直到翌年的1月份或2月份，分别为0.76、0.70、 0.06μmolCO2?m-2?s-1 和 0.05μmolCO2?m-2?s-1。日变化曲线图表现为单峰形态，一般也是随着温度的升高而加大，随着温度的降低而减小。6:00～14:00，随着土壤温度的升高而增加，一般在16:00～18:00出现最高峰，此后，一直递减，直到次日4:00～8:00。由此计算出毛竹林地土壤年释放CO2量为33.94 t?hm-2?a-1，其中，林地异养呼吸、自养呼吸和凋落物呼吸分别占总呼吸的59.5%、28.3%和12.2%。
Abstract:The dynamics of CO2 concentration in Moso bamboo(Phyllostachys edulis) plantation was studied with CID-301 portable photosynthesis system in Huitong County, Hunan Province. The results showed that the soil total respiration rate, heterotrophic respiration rate, autotrophic respiration rate and litter annual respiration rate of Moso bamboo plantation were 2.13, 1.44, 0.69 and 0.31 μmolCO2?m-2?s-1, respectively. It was obvious that soil respiration rate exhibited strongly annual and daily dynamic pattern in Moso bamboo plantation. The annual dynamic pattern was represented with a single-peak curve. The respiration rates increased with increasing atmospheric and soil temperature from January to July. Total soil total respiration rate, heterotrophic respiration rate, autotrophic respiration rate and litter respiration rate reached their highest values in August, being 4.95, 3.01, 1.94 and 0.80 molCO2?m-2?s-1, respectively. All of these respiration rates discreased gradually with falling temperature from August to January or February in the next year. At this time, the respiration rates reached their lowest values, which were 0.76, 0.70, 0.06 and 0.05 μmolCO2?m-2?s-1, respectively. The daily variation of total soil respiration rate, heterotrophic respiration rate, autotrophic respiration rate and litter respiration rate of Moso bamboo plantation could also be represented with a single-peak curve. They usually showed a strong consistency with temperature. From 6:00 to 14:00, the respiration rates increased with increasing temperature, and reached the highest value from 16:00 to 18:00. After this time, they decreased until the time from 4:00 to 8:00 in next day. The amount of CO2 released from Moso bamboo plantation was 33.94tCO2?hm-2?a-1, including 59.5% heterotrophic respiration, 28.3% autotrophic respiration and 12.2% litter respiration.
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